期刊
CHEMICAL ENGINEERING JOURNAL
卷 449, 期 -, 页码 -出版社
ELSEVIER SCIENCE SA
DOI: 10.1016/j.cej.2022.137840
关键词
Heterogeneous electro-Fenton; Oxygen reduction reaction; Hemin; KHCO3-MgO dual-porogen
资金
- Program for the National Natural Science Foundation of China [52100183, 52170161, 52100184]
- Hunan Natural Science Foundation [2020JJ3009]
- Hunan Researcher Award Program [2020RC3025]
- Fundamental Research Funds for the Central Universities [531118010473]
- Science and Technology Innovation Program of Hunan Province [2021RC2057]
- China Postdoctoral Science Foundation [2021M700041]
Heterogeneous electro-Fenton (HEF) technology has attracted attention for its potential in degrading organic pollutants in water. In this study, a novel iron and nitrogen-doped carbon catalyst (FeN-C) was developed using KHCO3-MgO as dual-porogen. The catalyst showed high degradation efficiency and good stability, making it a promising candidate for practical application in wastewater treatment.
Heterogeneous electro-Fenton (HEF) technology has become a hot topic for degradation of organic pollutants in water. However, it remains a challenge to design effective catalysts for high H2O2 utilization and pollutant degradation. In this work, we explored a novel iron and nitrogen-doped carbon catalyst derived from hemin (FeN-C) using KHCO3-MgO as dual-porogen. The results suggested that the KHCO3-MgO dual-porogen could not only improve the porous characteristics of catalyst, but also expose iron sites and change the proportion of nitrogen species. The pollutant degradation results demonstrated that the Fe-N-C-700/HEF system exhibited high ciprofloxacin degradation efficiency of 93.82% within 50 min and mineralization efficiency of 87.87% within 90 min by low energy consumption. Moreover, cycle experiments and metal ions leaching experiments revealed that the catalyst had good stability and recyclability. Electron spin resonance (ESR) test and radical capturing experiment showed that (OH)-O-center dot was the dominant active species in this HEF system. In addition, the Fe-N-C-700/HEF system achieved satisfactory performance in the treatment of real water matrix, indicating the possibility for practical application in wastewater purification.
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